video: tegra: nvmap: Add hugetlbfs support

- For NvRmHeap_GpuMem, we are switching from a carveout to huge pages
obtained from hugetlbfs.
- Allocate a handle from VA using get_user_pages, when allocation is
requested from GPU heap.
- Introduce a new field to indicate that the pages are allocated from
hugetlbfs. This field will be useful while returning the correct heap
while querying the handle params for a handle which was created using
hugetlbfs.
- Update the query heap API for GpuMem heap to return the huge pages
memory values from meminfo.

Bug 4510173

Change-Id: I0dbef4c4e95969f8e3975a6dc58f10255db0635e
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3174720
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

include/uapi/linux/nvmap.h

@@ -94,6 +94,7 @@ struct nvmap_alloc_handle {
 	__u32 flags;		/* wb/wc/uc/iwb etc. */
 	__u32 align;		/* min alignment necessary */
 	__s32 numa_nid;		/* NUMA node id */
+	__u64 va;		/* virtual address to get huge pages from */
 };
 
 struct nvmap_alloc_ivm_handle {